Occasionally

偶

Accidental, Casual, Chance, Coincidental, Fellows, Idol, Image, Mate, Not, Occasionally, Once, Seldom, Statue, Unexpected

偶然

Accidental, Accidentally, By, Occasional, Occasionally, Random, Randomly, Unexpectedly

偶爾

Occasionally, On, Once

偶而

Occasional, Occasionally, Sometimes